WI:Polish King becomes the Grand Duke of Lithuania

I know that Jogaila's sister was married to Casimir of Pomerania, what if Casimir of Pomerania becomes the King of Poland and is fertile assuming that Louis of Hungary dies childless after his war with Dusan of Serbia, if Jogaila allies with ITTL Casimir IV because of the marriage would Casimir IV try to gain the Grand Duchy of Lithuania if Jogaila dies Childless after he was usurped by his enemies in order to convert Lithuania? would he try to avenge his brother in law?
 
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I know that Jogaila's sister was married to Casimir of Pomerania, what if Casimir of Pomerania becomes the King of Poland and is fertile assuming that Louis of Hungary dies childless after his war with Dusan of Serbia, if Jogaila allies with ITTL Casimir IV because of the marriage would Casimir IV try to gain the Grand Duchy of Lithuania if Jogaila dies Childless after he was usurped by his enemies in order to convert Lithuania?
Don't think so. There were other Gediminids.
 
I think abas is right. Poles wouldn't have been interested in messing with Lithuania while still having problems with the Teutonic Order. They would rather find one of the Gediminids and support him hoping to make him duke and recreate Polish-Lithuanian alliance.
 
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